text: #! /usr/bin/env python
  """Test the errno module
     Roger E. Masse
  """
  
  import errno
  from test import test_support
  import unittest
  
  std_c_errors = frozenset(['EDOM', 'ERANGE'])
  
  class ErrnoAttributeTests(unittest.TestCase):
  
      def test_for_improper_attributes(self):
          # No unexpected attributes should be on the module.
          for error_code in std_c_errors:
              self.assertTrue(hasattr(errno, error_code),
                              "errno is missing %s" % error_code)
  
      def test_using_errorcode(self):
          # Every key value in errno.errorcode should be on the module.
          for value in errno.errorcode.itervalues():
              self.assertTrue(hasattr(errno, value), 'no %s attr in errno' % value)
  
  
  class ErrorcodeTests(unittest.TestCase):
  
      def test_attributes_in_errorcode(self):
          for attribute in errno.__dict__.iterkeys():
              if attribute.isupper():
                  self.assertIn(getattr(errno, attribute), errno.errorcode,
                                'no %s attr in errno.errorcode' % attribute)
  
  
  def test_main():
      test_support.run_unittest(ErrnoAttributeTests, ErrorcodeTests)
  
  
  if __name__ == '__main__':
      test_main()
  